Telautograph.



No. 668,894, Patented Feb. 26, I90l.

' e. s. TIFFANY.

vTELAUTEIGRAPH.

(Application filed Dec. 20, 1900.) um Iodal.)

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iThn STATES PATENT OFFICE.

GEORGE S. TIFFANY, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE GRAY NATIONAL TELAUTOGRAPI-I COMPANY, OF NEW YORK, N. Y.

TELAUTOGRAPH.

SPECIFICATION forming part of- Letters Patent N 0. 668,894, dated February 26, 1901.

Application filed December 20, 1900. $erial No. 40,474. (No model.)

To a whmn it may concern.-

Be it known that I, GEORGE S. TIFFANY, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Telautographs, fully described and represented in the following specification and the accompanying drawing, forming a part of the same.

This invention relates to improvements in tel-autographic apparatus, and particularly to telautographic apparatus of that class in which the movements of the receiving-pen in unison with the transinitting-tracer are effected by variations in the strength of the current sent over line from the transmitting instrument to the receiving instrument, such variations in current strength being in turn effected by and corresponding to the movements of the transmitting-tracer.

In two applications filed by me October 19, 1900, Serial Nos. 33,589 and 33,590 is shown and described at length a telautographic apparatus containing for each of the main-line circuits an independent circuit, including a source of electric energy, from which current is supplied to the main-line circuit and also means controlled by the transmitting-tracer whereby the current so supplied to the mainline circuit is varied in strength during the writing operation according to the movements of the transmitting-tracer, such currents of varying strength through suitable devices at the receiving instrument causing the receiving-pen to move in unison with and to reproduce the writing or other matter traced by the transmitting-tracer. The presentinvention has especial reference to telautographic apparatus of this type, the improvements of the present invention relating particularly to means controlled by the transmitting-tracer for so varying the strength of the current supplied to the main-line circuits. The means provided for this purpose by the present invention may be used in conjunction with any suitable devices at the receiving instrument such, for example, as the movable coils shown and described in my aforesaid applications.

Inthe accompanying drawingisillustrated, partly in diagram, so much of a transmitting instrument as is necessary for an understanding of the present invention.

In said drawing, B represents the transmitting-tracer, (usually a pencil,) which is carried by a pair of hinged arms 2 3, pivoted eccentrically to a pair of arms 4 5, connected, respectively, to left and right hand main-line wires a 1), leading to a suitable receivinginstrumentsuch, for example, as that illustrated in Fig. 2 of my applications before referred to. As the transmitting-tracer B is moved in writing, the arms 4 5 are rotated thereby, and as the latter are thus rotated they effect, through means which will presently be described, variations in the strength of the currents sent over the mainline wires 0, 1).

Ourrent is supplied to the main-line wires a b from two local circuits at the transmitting-station which are independent of the main-line circuits a b and which include a source of electric energy consisting of a motor M, the opposite brushes 2" i of which, bearing on the commutator of the rotating armature I or I, respectively, are connected to opposite poles of a battery H, the positive pole of which is grounded, brush '6' being connected to the negative pole of said battery, while brush t is connected to the positive pole thereof. The armatures I I are located beneath the path of movement of the rotary arms 4 5, so that com in utators carried thereby may be engaged by contacts 15, carried by said arms. Through these contacts 15 and arms 4 5 currents are shunted from the independent circuits into the main-line circuits 0L2 1), respectively, which vary in strength according to the positions of these contacts between the brushes M of the motors M, as will presently appear.

The independent current-supplying circuits will now be described. With the master-switch D in the position in which it is shown, which is the position it occupies when the transmitting-tracer is hung up, the transmitting and receiving instruments are out of circuit. When the master-switch is moved in the direction of the arrow, the negative pole of the battery H will be connected by wire it, contact-brush 16 contact-plate 17 on the master-switch, and wires 71/ h to the brushes 5', of the motorsM, while the positive pole of the battery II will be connected by wire h contact-brush 16, contact-plate 17 on the master-switch D, and wires h h to the opposite brushes 4? of the motors. The positive pole of the battery H is" grounded at G, when master-switch D is moved to the posi tion stated, by wire h, connected to contactspring 18, (contacting with plate 17,) brush 16, and wire it so that with the parts in such position a current is passing through each of these independent circuits from the negative pole of the battery H and through the commutators of armatnres I 1, contacts 15, arms 4 5, wires a b, contact-plates 13 13 and brushes 14 1 1 to the main-line circuits (1 b, respectively, leading to the receiving instrument, which, as before stated, may be the receiving instrument shown and described in my said prior applications or any other suitable receiving instrument. The strength of the currents delivered from these independent circuits to the mainline circuits will, as before stated, be dependent upon the positions of the contacts 13 relatively to the opposite terminals or brushes *6 1' of the motors I I, since the nearer these contacts are to the terminals or brushes 71' of said motors the greater the voltage between said contacts and the opposite terminals or brushes 2' of said motors or ground, and vice versa,.or, in other words, if we assume the voltage of the battery 11 to be thirty volts and a contact 15 to be one-third the distance from the terminal or brush 2' of the motor the difference of potential between the contact 15 and ground will be approximately ten volts, and if said contact be midway between the terminals 2" 2' of said motor the difference of potential between the contact and ground will be approximately fifteen volts. From this construction it results that as the arms 1 5 are rotated by the movement of the transmitting-tracer B the contacts 15 are caused to assume different. positions relatively to the terminals c' "L of the plates I I and to shunt into the main-line circuits a b currents which vary in strength in accordance with the positions thus assumed by the contacts 15, and

consequentlyin accordance with the positions assumed by the transmitting tracer, the strength of the currents increasing as the contacts 15 approach the terminals or brushes t" of the motors and decreasing as they approach the terminals or brushes 2' thereof.

Of course it will be understood that in the receiving instrument, which may be connected with the transmitting instrument shown, the pen-arms of such receiving instrument instead of being connected to pen-arm drums, as in my prior applications before referred to, will bec'onnected, respectively, to devices like the arms 4 5, so that the angular movements of the receiving-pen will be the same as those of the transmitting-tracer.

' What I claim is- In a telantogra'phic apparatus the combination of a transinitting-tracer, a main-line circuit, an independent circuit including a motor having a rotating armature with which the opposite terminals of the motor make contact, a movable member contacting with said motor, and connections between the transmitting tracer and said movable member whereby the latter is moved relatively to the terminals of the motor so as to shunt from said independent circuit into the main-line circuit'currents varying in' strength according to the movements of the transniittingtracer, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

GEORGE S. TIFFANY.

Witnesses:

T. F. KEHOE, S. WINTHAL. 

